Nuprl Lemma : biject_wf
13,42
postcript
pdf
A
,
B
:Type,
f
:(
A
B
). Bij(
A
;
B
;
f
)
latex
Up
fun
1
,
fun
1
Definitions
P
&
Q
,
Bij(
A
;
B
;
f
)
,
,
t
T
,
x
:
A
.
B
(
x
)
Lemmas
surject
wf
,
inject
wf
origin
A, B:Type, f:(A
B). Bij(A;B;f) 
A, B:Type, f:(AB). Bij(A;B;f) Tx:A. B(x)